RU171832U1 - PLATFORM FORM - Google Patents

Abstract

The utility model relates to construction and can be used in the construction of public civil and industrial buildings with a prefabricated monolithic beam frame. The technical result consists in ensuring the versatility of the fixed formwork slab, expanding its functionality and increasing the hardness of the floor slab due to the continuity of the longitudinal tensile reinforcement. To achieve a technical result, a fixed formwork slab made of hard concrete with a raised upper surface containing longitudinal grooves (3) forming longitudinal ribs located between them (2) reinforced with flat frames with reinforcing outlets (6) located perpendicularly along their length is proposed plate plane. The slab is made by a single monolith with a height from 50 mm to 220 mm during a one-stage concreting process and also contains transverse spline grooves (5) formed on longitudinal surfaces on the relief surface. What is new is that longitudinal channels (4) are formed at the base of the slab to allow continuous continuous prestressing or nonstressing reinforcement. 3 ill.

Description

The utility model relates to construction and can be used in the construction of public civil and industrial buildings with a prefabricated monolithic beam frame.

Non-removable reinforced concrete or reinforced cement formwork is known, made of concrete of classes B15 ... B25 and reinforced with welded, woven or combined nets (Kudzis, A.P. Reinforced concrete and stone construction: Textbook for construction. Special Universities. In 2 parts. H 2. Designs of industrial and civil buildings and structures. - M .: Higher school, 1989. - S. 43-44, analogue).

The disadvantages of the known analogue are: low bearing capacity, rigidity and crack resistance.

Also known is a fixed formwork slab containing a monolithic base of rigid concrete mixture 40-50 mm thick, in which tensioned reinforcing bars and at least four longitudinal gutters are round with a radius of 70-90 mm or elliptical with a small radius of 70-90 mm cross-section with a distance between their axes equal to 200-370 mm, forming longitudinal reinforced with, for example, flat skeleton ribs 50-80 mm high with reinforcing outlets, at least in some of them laid along their length perpendicular to the plane of the plate with a distance of at least between a pair of them equal to 200-300 mm (RF patent No. 2199637 C1, priority date 12/27/2001, publication date 2/27/2003, authors: Altukhov A.L. et al., RU, prototype).

The disadvantages of this analogue are: insufficient bearing capacity of the joint seam of monolithic and precast reinforced concrete during the perception of shear forces due to the design features of the surfaces overlapping when monolithic; increased laboriousness of manufacture, arising due to the need for layer-by-layer laying of concrete mixture, the use of formwork and vibration-forming agents of individual manufacture, as well as the use of tensile reinforcement when it is inappropriately used in the case of small spans.

As a prototype, a fixed formwork slab made of hard concrete with a raised upper surface containing longitudinal grooves forming longitudinal ribs located between them, reinforced with flat frames with reinforcing outlets along their length perpendicular to the plane of the slab, also containing longitudinal reinforcement, was adopted. In this case, the plate is made as a single monolith with a height of 50 mm to 220 mm during the one-stage concrete process and additionally contains transverse spline grooves formed on the longitudinal surface of the ribs, and the longitudinal reinforcement in the plate is installed tensioned and / or non-stressed, depending on the span (RF patent No. 161713 U1, priority date 12/02/2015, publication date 04/27/2016, authors: Koyankin A.A. et al., RU, prototype).

The disadvantages of the prototype are, firstly, the insufficient rigidity of the arranged disk of the floor due to the inability to create a continuous longitudinal prestressed reinforcement, and secondly, the lack of versatility of the slab due to the inability to use the same product in ceilings with prestressed and non-stressed reinforcement.

The technical problem is the creation of a universal plate of fixed formwork with the possibility of using it both in ceilings with non-tensile reinforcement and in ceilings with tensile reinforcement to increase the rigidity of the floor disk due to the continuity of longitudinal tensile reinforcement.

To solve a technical problem, a fixed formwork slab made of hard concrete with a raised top surface containing longitudinal grooves, forming longitudinal ribs located between them, reinforced with flat frames with reinforcing outlets along their length perpendicular to the plane of the slab, was proposed. The slab is made by a single monolith with a height of 50 mm to 220 mm in a one-stage concrete process and also contains transverse spline grooves formed in longitudinal ribs on the relief surface. According to the utility model, what is new is that longitudinal channels are formed at the base of the slab for passing continuous prestressed or non-stressed reinforcement.

In FIG. 1 schematically shows a plate of fixed formwork, top view; in FIG. 2 - section aa; in FIG. 3 - section BB.

The fixed formwork slab is made of rigid concrete mixture 1 with a raised upper surface and contains longitudinal ribs 2 located between the longitudinal, elliptical or other cross-sectional longitudinal grooves 3 forming them. The plate in the lower part has hollow channels 4 for the passage of tensile or non-tensile reinforcement. In the longitudinal ribs 2, transverse keyways 5 are made to increase the bearing capacity of the joint of monolithic and precast concrete when perceiving shear forces. The longitudinal ribs 2 are reinforced along the length, for example, with flat frames (not shown conditionally) with reinforcing outlets 6 located perpendicular to the bottom plane of the plate. In this case, the plate is made by a single monolith with a height of 50 mm to 220 mm, with the possibility of the formation of keyways 5.

The fixed formwork slab is made as follows: in the formwork (not shown conditionally) used for the manufacture of hollow core slabs, vibro-hollow formers (conditionally not shown) used for the manufacture of hollow core slabs are installed; elements are installed, for example tubes (not shown conditionally) forming channels 4; the installation of flat frames (conditionally not shown) with reinforcing outlets 6 and the installation of keying (conditionally not shown); and then the hard concrete mixture 1 is laid. After the concrete mixture 1 has set the required strength, demolition takes place.

The advantage of the claimed slab of fixed formwork is its versatility, due to the presence of channels that allow the installation of both continuous prestressed reinforcement to increase the stiffness of the disk and non-stressed reinforcement depending on the span when forming the hard drive of the ceiling, which also indicates the expansion of the functional capabilities of the slab.

Claims (1)

Fixed formwork slab made of hard concrete with a raised top surface containing longitudinal grooves forming longitudinal ribs located between them, reinforced with flat frames with reinforcing outlets arranged along their length perpendicular to the slab plane, and the slab is made as a single monolith in height from 50 mm to 220 mm in a one-stage concreting process and also contains transverse spline grooves formed on the longitudinal surface of the ribs, formed in longitudinal ribs, characterized in that in Hovhan plate are formed longitudinal channels for the passage of continuous Free of tension or prestressing reinforcement.

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